package com.ly.framework.config;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.sql.DataSource;

import com.ly.common.enums.DataSourceType;
import com.ly.common.utils.spring.SpringUtils;
import com.ly.framework.config.properties.DruidProperties;
import com.ly.framework.datasource.DynamicDataSource;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.alibaba.druid.spring.boot.autoconfigure.properties.DruidStatProperties;
import com.alibaba.druid.util.Utils;

/**
 * druid 配置多数据源
 * @author
 */
@Configuration
public class DruidConfig {

    @Bean
    @ConfigurationProperties ("spring.datasource.druid.master")
    public DataSource masterDataSource (DruidProperties druidProperties) {
        DruidDataSource dataSource = DruidDataSourceBuilder.create ().build ();
        return druidProperties.dataSource ( dataSource );
    }

    @Bean
    @ConfigurationProperties ("spring.datasource.druid.slave")
    @ConditionalOnProperty (prefix = "spring.datasource.druid.slave", name = "enabled", havingValue = "true")
    public DataSource slaveDataSource (DruidProperties druidProperties) {
        DruidDataSource dataSource = DruidDataSourceBuilder.create ().build ();
        return druidProperties.dataSource ( dataSource );
    }

    @Bean (name = "dynamicDataSource")
    @Primary
    public DynamicDataSource dataSource (DataSource masterDataSource) {
        Map<Object, Object> targetDataSources = new HashMap<> ();
        targetDataSources.put ( DataSourceType.MASTER.name (), masterDataSource );
        setDataSource ( targetDataSources, DataSourceType.SLAVE.name (), "slaveDataSource" );
        return new DynamicDataSource ( masterDataSource, targetDataSources );
    }

    /**
     * 设置数据源
     * @param targetDataSources 备选数据源集合
     * @param sourceName        数据源名称
     * @param beanName          bean名称
     */
    public void setDataSource (Map<Object, Object> targetDataSources, String sourceName, String beanName) {
        try {
            DataSource dataSource = SpringUtils.getBean ( beanName );
            targetDataSources.put ( sourceName, dataSource );
        } catch ( Exception e ) {
        }
    }

    /**
     * 去除监控页面底部的广告
     */
    @SuppressWarnings ( {"rawtypes", "unchecked"})
    @Bean
    @ConditionalOnProperty (name = "spring.datasource.druid.statViewServlet.enabled", havingValue = "true")
    public FilterRegistrationBean removeDruidFilterRegistrationBean (DruidStatProperties properties) {
        // 获取web监控页面的参数
        DruidStatProperties.StatViewServlet config = properties.getStatViewServlet ();
        // 提取common.js的配置路径
        String pattern = config.getUrlPattern () != null ? config.getUrlPattern () : "/druid/*";
        String commonJsPattern = pattern.replaceAll ( "\\*", "js/common.js" );
        final String filePath = "support/http/resources/js/common.js";
        // 创建filter进行过滤
        Filter filter = new Filter () {
            @Override
            public void init (javax.servlet.FilterConfig filterConfig) throws ServletException {
            }

            @Override
            public void doFilter (ServletRequest request, ServletResponse response, FilterChain chain)
                    throws IOException, ServletException {
                chain.doFilter ( request, response );
                // 重置缓冲区，响应头不会被重置
                response.resetBuffer ();
                // 获取common.js
                String text = Utils.readFromResource ( filePath );
                // 正则替换banner, 除去底部的广告信息
                text = text.replaceAll ( "<a.*?banner\"></a><br/>", "" );
                text = text.replaceAll ( "powered.*?shrek.wang</a>", "" );
                response.getWriter ().write ( text );
            }

            @Override
            public void destroy () {
            }
        };
        FilterRegistrationBean registrationBean = new FilterRegistrationBean ();
        registrationBean.setFilter ( filter );
        registrationBean.addUrlPatterns ( commonJsPattern );
        return registrationBean;
    }
}
